<div class="search">
    <form id="searchform" method="get" action="<?php bloginfo('url'); ?>/">
        <div class="search-box">
            <input type="text" size="70" maxlength="100" name="s" id="s" value="Search for an existing question..." onclick="if (this.value=='Search for an existing question...') this.value=''" /> 
        </div>
        <div class="search-submit">
            <input type="image" src="<?php echo get_bloginfo('template_directory'); ?>/images/search-btn.jpg" onclick="submit()"/>
        </div>
    </form>
</div>
     